Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e93030e085cd39c…

MALICIOUS

PDF

84.5 KB Created: 2021-02-07 20:38:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 641860dbd9e0f5b18c1d3bf2ced2c9a0 SHA-1: 23f45100faabb5f688f29154d7937b5f025d54d2 SHA-256: 0e93030e085cd39ce5a85a6baca862fc929ae6601bd1bf814aee525969df4dd5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous external URLs suggests a phishing or SEO manipulation attempt, potentially leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/aws?utm_term=precalculus+textbook+pdf+ninth+edition PDF link annotation
    • https://cdn.sqhk.co/wodabakope/Fhejjjg/action_truck_sales_hamilton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_601fb5e2bf102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5fec85b730afb.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/gjutbfE/xajetiguluredo.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/bZhb9aC/euro_truck_driving_simulator_download_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_601e7cb2a7be9.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/ie0zwhe/talking_friends_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/mupijuwo/ibjahiH/67993251732.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/rijinifitorokilatuja.pdfIn PDF document text
    • http://kurekarer.22web.org/blues_brothers_album.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/Njgijhc/979_arcade_st_saint_paul.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/cbgjjjP/riguwovesufamuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/hhhh2hf/fishing_planet_hook_size_for_trout.pdfIn PDF document text
    • http://xoguvux.22web.org/35085987520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokilezitewoj.epizy.com/jerotewupaturegurimibor.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/86606170393.pdfIn PDF document text
    • http://roxeruteruda.epizy.com/49136969902.pdfIn PDF document text
    • http://badokelo.rf.gd/87809041976.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001189a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1189A 25172 bytes
SHA-256: 35c48249aa6680cbe4a01c331f4f451cec252ed9a143db119bdd8312626ebc60
font_00_sfnt_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 5516 bytes
SHA-256: f02068c15ed82f32bc08a08cdf67732e584244992096c03914feb71b3b98f546
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 10420 bytes
SHA-256: 5d65c3893778f39c49ef3ca8e3f25c4739bb600405585e2efe88840f0cdc8293

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